That’s a cool story by S_R.
Reminded me of my humble story, when one of my forefathers passed away, one of my regrets was not keeping and passing down more of their belongings, hats, blankets, tools, photos.
One left to us, a rifle - now 90 years old, USA made. I worried someone could get hurt, so I took it to a gun smith shop, for a nominal fee, they gave it a tune up, they know how to test fire and not get injured.
Phone rang, “Sir, your rifle works and is ready for pick up”. Did it again, for another rifle as well.
Much ammo has become more powerful, I could be wrong, but if one goes lower grain and not + P, I think it my be safer; One can research it.
But as another posted, shot gun ammo is different than “bullets”, and personally I’d have less worry.
I’d be more concerned about ensuring you know the choke size or if you can change chokes - as using the wrong ammo/choke size - to me is critical.
One of mine is a single shot 20g, but it’s a new store purchase. Mine offers exchangeable choke sizes, quite versatile.
Sounds like you got a USA “classic”. Your call of course, but personally, I’d would not put it in a glass case at home, but I’d use it, for hunt, range, Skeet. If not, it would still be a great convo piece in glass cabinet.